docs: def search_related_tags(self,series_search_text=None,tag_names=None,response_type=None,params=None):
          """
          Function to request the related FRED tags for one or more FRED tags matching a series search.
          `<https://research.stlouisfed.org/docs/api/fred/series_search_related_tags.html>`_
  
          :arg str series_search_text: The words to match against economic data series. Required.
          :arg str tag_names: Tag names that series match. Separate with semicolon as in "income;bea". Required.
          :arg str response_type: File extension of response. Options are 'xml', 'json',
                          'dict','df','numpy','csv','tab,'pipe'. Required.
          :arg str realtime_start: The start of the real-time period. Format "YYYY-MM-DD"
          :arg str realtime_end: The end of the real-time period. Format "YYYY-MM-DD"
          :arg int limit: The maximum number of results to return. Options 1 to 1000
          :arg int offset: Data offset. Options >=0
          :arg str order_by: Order results by values of the specified attribute. Options are  'series_count',
                              'popularity', 'created', 'name', 'group_id'
          :arg str sort_order: Sort results for attribute values specified by order_by. Options are 'asc','desc'
          :arg str tag_group_id: Tag ID to filter tags by. Options are 'freq', 'gen', 'geo', 'geot', 'rls', 'seas', 'src'
          :arg str tag_search_text: The words to find matching tags with.
          :arg str exclude_tag_names: Tag names to exclude. Separate with semicolon as in "income;bea"
          :arg bool ssl_verify: To verify HTTPs.
          """
          path = '/series/search/related_tags?'
          params['series_search_text'], params['tag_names'] = series_search_text, tag_names
          response_type = response_type if response_type else self.response_type
          if response_type != 'xml': params['file_type'] = 'json'
          response = _get_request(self.url_root,self.api_key,path,response_type,params,self.ssl_verify)
          return response